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Chinese Physics Letters 2013年第5期30卷 152-154页

作者： ZHANG Yan-Fei ZHAO Su-Ling XU Zheng key laboratory of luminescence and optical information Beijing Jiaotong UniversityBeijing 100044 Institute of Optoelectronics technology Beijing Jiaotong UniversityBeijing 100044

We prepare a tandem (OLED) with two independent units and three electrodes. One of the units consists of ITO/TPD/Al_(q3):DCJTB (5%)/LiF/Al/Au, and the other is Al/Au/TPD/Al_(q3)/LiF/Al. Two units sharing one transparent intermediate electrode Al/Au, together constitute the entire device. With the same current density, the voltage of the entire device is approximately equal to the sum of two units. The current efficiency of the entire device is several times higher than the sum up of two components. Without directly contacting an external power supply, the bi-metal intermediate electrode has the ability to produce electrons and holes for two adjacent emitting units, respectively. This kind of tandem device is characterized by controllable emission color and higher current efficiency than its two components added up.

关键词： Efficiency transparent electrode

Polarization Stability of a Double-Loop Interferometer Based on a Planar 3 × 3 Coupler

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Chinese Physics Letters 2012年第4期29卷 112-115页

作者： WANG Ya-Ping WU Chong-Qing YAN Ping Institute of optical information Key Laboratory of Education Ministry on Luminescence and Optical Information TechnologyBeijing Jiaotong UniversityBeijing 100044 Center for Photonics and Electronics State Key Laboratory of TribologyDepartment of Precision InstrumentsTsinghua UniversityBeijing 100084

An interferometer with double loops based on a planar 3 × 3 coupler is *** main factors that cause the instability of the polarization state are obtained by theoretical analysis and ***,the stability of the polarization state is described quantitatively by the time-varying vector of *** these effective measures,interference with a stable polarization state at all times is achieved.

关键词： polarization interferometer Polarization

Study on luminescence Properties of a Novel Rare Earth Complex Eu(TTA)_2(N-HPA)Phen

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Journal of Rare Earths 2007年第2期25卷 143-147页

作者：张妍斐徐征吕玉光张福俊王勇张敬畅 key laboratory of luminescence and optical information Ministry of Education Institute of Optoelectronic Technology Beijing Jiaotong University Institute of Modern Catalysis Beijing University of Chemical Technology

A novel rare earth complex Eu（TTA）2（N-HPA）Phen （TTA = thenoyltrifluoroacetone, N-HPA = N-phenylanthranilic acid, and phen = 1,10-phenathroline ）, which contains three different ligands, was synthesized. The Eu complex was blended with poly N-vinylcarbazole （PVK） in different weight ratios and spin coated into films. The luminescence properties of films were investigated and energy transfer between PVK and the complex was discussed. Multilayer structural devices consisting of ITO/PVK： Eu （TTA）2 （N-HPA） phen/BCP/Alq3/Al were fabricated with PVK ： Eu （TTA）2（N-HPA） as light-emitting layer. Increasing the concentration of Eu in the PVK thin film would inhibit the emission of PVK to different degrees. Finally, the pure red luminescence of europium（ Ⅲ ） was observed when the doping weight ratio was approximately 1 ： 5, which indicated an effective energy transfer from PVK to rare earth complex.

关键词： energy transfer ligand electroluminescence rare earth complex

Effects of sputtering conditions on electrochemical behavior and physical properties of Ni-Mo alloy electrode

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中国有色金属学会会刊：英文版 2006年第5期16卷 1092-1096页

作者：黄金昭徐征李海玲亢国虎王文静 key laboratory of luminescence and optical information Ministry of EducationInstitute of Optoelectronic TechnologyBeijing Jiaotong University Beijing Solar Energy Research Institute

Sputtering method was used to prepare Ni-Mo alloy electrodes for hydrogen production in alkaline solution. The influences of the working pressure during deposition and the substrate temperature on the electrochemical behavior of electrode were characterized by steady-state polarization plot and Tafel polarization curve measurements. And the physical properties of electrodes were characterized by XRD, SEM, AFM and EDS. It is found that the overpotential is significantly influenced by the working pressure which affects critically the electrode surface morphology, and two Tafel regions are observed for each sample. The overpotential value does not change very much with the substrate temperature. The XRD results indicates that the electrodes should be considered nanocrystalline. Thornton model for the microstructure of sputter-deposited electrodes is referred to explain the observed microstructure change.

关键词：氢渐近反应过电压 Ni-Mo合金电极物理性能电化学

Conducting Graphene Decorated Li3V2（PO4）3/C for Lithium- Ion Battery Cathode with Superior Rate Capability and Cycling Stability

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Chinese Journal of Chemistry 2016年第8期34卷 795-800页

作者： Pan Zhou Dawei He key laboratory of luminescence and optical information Ministry of Education Institute of Optoelectronic Technology Beo'ing Jiaotong University Beijing 100044 China

In this study, core‐shell structured Li 3 V 2 (PO 4 ) 3 /C wrapped in graphene nanosheets has been successfully prepared. The reduction of graphene oxide and the synthesis of Li 3 V 2 (PO 4 ) 3 /C are carried out simultaneously using a chemical route followed by a solid‐state reaction. The effects of conducting graphene are studied by X‐ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Raman spectra and electrochemical measurements. The results reveal that the graphene sheets not only form a compact and uniform coating layer throughout the Li 3 V 2 (PO 4 ) 3 /C, but also stretch out and cross‐link into a conducting network around the Li 3 V 2 (PO 4 ) 3 /C particles. Thus, the graphene decorated Li 3 V 2 (PO 4 ) 3 /C electrode exhibits superior high‐rate capability and long‐cycle stability. It delivers a reversible discharge capacity of 178.2 mAh·g −1 after 60 cycles at a current density of 0.1 C, and the rate performances of 176, 169.3, 156.1 and 135.7 mAh·g −1 at 1, 2, 5 and 10 C, respectively. The superior electrochemical properties make the graphene decorated Li 3 V 2 (PO 4 ) 3 /C composite a promising cathode material for high‐performance lithium‐ion battery.

关键词： lithium‐ion battery cathode material Li3V2(PO4)3/C graphene nanosheet electrochemical performance

Influence of pH value on properties of YPO_4:Tb^(3+) phosphor by co-precipitation method

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Journal of Rare Earths 2015年第4期33卷 346-349页

作者：李旭王皓岩关丽付跃举郭镇袁坤生铁利成杨志平滕枫 Hebei key laboratory of Optic-electronic information and Materials College of Physics Science and Technology Hebei University key laboratory of luminescence and optical information Ministry of Education School of Science Beijing Jiao Tong University

A series of Y1_xPO4：xTb3＋（x=0.005-0.1） phosphors were successfully fabricated by using co-precipitation method with NHzH2PO4 as phosphorus source. The structure and morphology characterization of the luminescent material was investigated with X-ray powder diffraction （XRD） and field emission scanning electron microscopy （FESEM）. The XRD patterns indicated that the samples belonged to tetragonal phase. luminescence properties were discussed by measuring the excitation and emission spectra. The phosphor could be excited by UV light （340-390 nm） and emitted green light, with the emission peaks located at 491 （5Da→7F6）, 550 （SD4→7Fs）, 589 （5D4→7F4） and 624 nm （SD4→TF3）. In addition, the pH value and activator concentration had great effects on the emission intensity. The results illuminated that this phosphor could be used for UV based white light emitting diodes and co-precipitation method could be used to prepare better appearance phosphor.

关键词： luminescence phosphor co-precipitation pH value rare earths

Organic photodetectors based on transparent electrodes for application in ultraviolet light detection

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Science China(Technological Sciences) 2012年第6期55卷 1551-1555页

作者： DAI Qian ZHU Lu SUN Jian ZHANG XiQing WANG YongSheng key laboratory of luminescence and optical information Ministry of EducationInstitute of Optoelectronic TechnologyBeijing Jiaotong UniversityBeijing 100044China

A high performance heterojunction organic ultraviolet photodetector based on NPB and Bphen has been fabricated. A trans- parent conducting polymer PEDOT：PSS coated quartz substrate instead of ITO coated glass substrate as anode is propitious to detect shorter wavelength ultraviolet light. As a result, the device shows a low dark current density, a high responsivity of 502 mA/W and a detectivity of 2.67x1012 cm Hz1/Zfw which is illuminated by a 220 nm ultraviolet light with an intensity of 1.6 mW/cm2. Moreover, the performance of the PEDOT：PSS transparent electrode device is better than the semi-transparent A1 electrode device electrode because of the higher transmittance and electrode properties.

关键词： ultraviolet photodetector conducting polymer PEDOT: PSS

A new method for measuring laser beam straightness error based on common-path compensation

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Optoelectronics Letters 2009年第5期5卷 383-386页

作者：由凤玲冯其波张斌翟玉生曹睿方恒楚 key laboratory of luminescence and optical information of Ministry of Education Beijing Jiaotong University

A novel method for laser beam straightness error measurements based on common-path compensation is proposed. The basic principle of the method is described and the math-model is established. Furthermore,the influence of laser beam drift on straightness error measurements is analyzed. The experimental results show that the measurement accuracy can be greatly improved by using the common-path compensation for laser beam drift.

关键词：直线度误差误差测量激光束路径补偿光束漂移数学模型测量精度

Simulation analysis of evolution of hot-images induced by coplanar multi-scatterers

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Chinese Physics B 2009年第5期18卷 1884-1890页

作者：彭涛赵建林李东叶知隽谢良平 Institute of optical information Science and technology Shaanxi Key Laboratory of Optical Information TechnologySchool of ScienceNorthwestern Polytechnical University

Based on the diffraction theory model for hot-image formation, the evolution of hot-images induced by multiscatterers located in the same plane perpendicular to the propagation axis is numerically simulated. The simulation results show that hot-images induced by coplanar multi-scatterers are also coplanar no matter whether they exist simultaneously or severally. However, if they exist simultaneously the peak intensity of the primary hot-images is weaker than if they exist severally. The unequal competition for energy between the scattered beams from the scatterers leads to the fact that part of the corresponding hot-images are relatively enhanced and the others are restrained. The results show that the hot-images of certain scatterers become stronger when any of these parameters, i.e. amplitude modulation coefficient, phase modulation coefficient and size of the surrounding scatterer, decrease.

关键词： hot-image small-scale self-focusing optical damage scatterer

Optimization of a poly (p-phenylene benzobisoxazole)-based light-emitting device with a complex cathode structure

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Chinese Physics B 2013年第11期22卷 607-611页

作者：张晓晋何志群汪璟穆林平赵瓛梁春军庄启昕韩哲文 key laboratory of luminescence and optical information Ministry of Education Institute of Optoelectronic TechnologyBeijing Jiaotong University key laboratory for Specially Functional Polymeric Materials and Related technology Ministry of Education East China University of Science and Technology

In this work, we report the preparation of a series of electroluminescent （EL） devices based on a high-performance polymer, poly（p-phenylene benzobisoxazole）（PBO）, and their optoelectronic properties, which have been rarely explored. The device structure is optimised using a complex cathode structure of tris-（8-hydoxyquinoline） aluminium （Alq3）/LiF/Al. By tuning the thickness of the Alq3 layer, we improve the device efficiency dramatically in an optimized condition. Further analysis reveals that the Alq3 layer in the complex cathode structure acts as a hole blocker in addition to its electron-injection role. A green light emission with a maximum brightness of 8.7×103 cd/m2 and a moderate current efficiency of 4.8 cd/A is obtained. These values are the highest ever reported for PBO devices. The high operational stability demonstrated by the present device makes it a promising tool for display and lighting applications. A new material is added to the selection of polymers used in this field up to now.

关键词： electroluminescence organic semiconductors light-emitting devices electronic transport phe-nomena